VIEWS: 1 PAGES: 11 CATEGORY: Optics POSTED ON: 6/7/2011
This Non-provisional application claims priority under 35 U.S.C. .sctn.119(a) on Patent Application No(s). 096147918 filed in Taiwan, Republic of China on Dec. 14, 2007, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION 1. Field of Invention The present invention relates to a projection system, a projection lens module, an actuator and a driving method of the actuator. More particularly, the present invention relates to a projection system, a projection lens module, an opticalactuator and a driving method of the optical actuator. 2. Related Art In general, an optical actuator is applied to a projection system in order to increase the number of pixels and smooth an image. The projection system includes an image generating device and a projection lens module. The image generatingdevice generates the image according to the technology of digital micro-mirror devices (DMDs), three liquid crystal displays (3LCD) or liquid crystal on silicon (LCoS) panels. Then, the projection lens module projects the image onto a screen. Theoptical actuator is disposed between the image generating device and the projection lens module, and swings to increase the number of pixels and smooth the image. The optical actuator may be a reflective or transmissive actuator. The transmissive optical actuator is disposed between the image generating device and the projection lens module. The reflective optical actuator is disposed at the projectionlens module. After the image generating device generates the image, the image will be transferred to the optical actuator. However, the transmissive optical actuator is not commercialized under the spatial limitation and the large swinging angle which has to be 50 times of that of the reflective optical actuator. There are two conventional methods of controlling the reflective optical actuator to operate. The first method is performed according to pulse width modulation (PWM) in conjunction with t
"Projection System, Projection Lens Module, Optical Actuator And Its Driving Method - Patent 7931379"